Degradation of Coke and Char during Solution Loss Reaction

In order to find its feasibility as blast furnace coke feedstock, non-metallurgical coal was compared with metallurgical coal in terms of reactivity and degradation during CO2 gasification reaction, with emphasis on the difference between the pore structure of coke and that of char. The following results were obtained:(1) The higher reactivity of non-metallurgical coal char is due to the fact that their coal rank is lower.(2) Though the pore structure of metallurgical coke is composed mainly of macropores, pore walls of char are either abundant in micropores when the rank is low, or practically nil in any size when the rank is relatively high.(3) Open macropores characterize the pore structure of coke, while char has a considerable number of closed pores.(4) The deterioration of the structural strength of coke becomes greater than that of char as gasification reaction proceeds.